Rexroth MG / MK throttle / one-way throttle valve 
 MK from path to path 30, a total of seven specifications. 
 Pressure oil flows from the back of the poppet valve, used as a throttle, if the inflow from the opposite direction to use it as a one-way valve, which is part of the fluid can flow in a circular aperture, you can clear the orifice sediments. 
 MG-type valve can be two-way throttle. Oil through the orifice formed between the next hole flow to the body and adjustable sleeve. Rotating the sleeve to be able to change the throttle section. 
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